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Originally posted by Jehosephat
Reports for the Gulf war states that the Abrams normally engages the enemy at 2000m but was able to effectivly engage at 4000m. The the fact of Rifling being more accurate doesn't hold much wieght, especailyl with Ballistics.
Reading some comments from former tankers, specifically a Master Gunner, one downside to rifling is the increased dispirsion of the explosion on impact. Thus robbing the progectile of some prenetration ability
In January 2004, Land Systems was awarded a contract to develop a new smoothbore 120mm gun for the British Army Challenger tanks. Rheinmetall of Germany will provide examples of the L55 smoothbore gun fitted on the Leopard 2A6 for the programme. A technical demonstrator will be produced by 2006.
I seem to also recall that there was a problem of getting the ammo for the rifiled main gun and that the supplier was overseas on not domestic. So instead of having ot rely on foreign sources for the rifled ammo they went to a NATO standerd
Originally posted by GrOuNd_ZeRo
Good post Fritz, but nothing I didn't already know though.
As stated before, HESH rounds are the main reason the L-30 barrel is rifled so they can be delivered accurately.
Smoothbore barrels allow for more velocity since there is no friction to slow the round down while Rifled barrels afford more accuracy.
However the Challenger 2 has one of the most accurate guns out there, however it's FCS wasn't as impressive as some other modern tanks.
Originally posted by lonemaverick
APFSDS rounds from a smoothbore are more accurate at a longer range than conventional rounds because they have a higher velocity and are more aerodynamic, so they can travel farther and they lose less velocity than a standard round. Plus like what was said before, HESH rounds don't penetrate armor, they're designed to cause spalling, which is virtually nonexistant in modern tanks with anti-spall liners.
Smoothbores are only effective to 2500m when firing sabots.
With a caliber of 120 millimeters (4.7 in), and a caliber length of 44, Rheinmetall's L44 tank gun has a length of 5.28 meters (5.77 yd). The gun's barrel weighs 1,190 kilograms (2,600 lb), and on the M1 Abrams the gun mount weighs 3,317 kilograms (7,310 lb)., while the new barrel (L55) is 55 calibers long, increasing the length by 1.30 meters (1.42 yd). The bore evacuator and the gun's thermal sleeve, designed to regulate the temperature of the barrel, are fabricated out of glass-reinforced plastic, while the barrel has a chrome lining to increase barrel life. Originally, the tank gun had a barrel life of anywhere between 400–500 rounds, but with recent advances in propellant technology the average barrel life has decreased to 260 rounds. In some cases, barrels have had to be replaced after only 50 fired projectiles
Originally posted by Zykloner
If i am not completely wrong most sabot/armour piercing amunition has some kind of construction that makes them rotate when traveling through air,...